如何解决BLE Android 如何传递特性以在 Fragment 中使用
我有一个 BLE 教程。我可以在 SPS 服务上发送和接收数据，这个数据 TX RX 在 Dialog_BTLE_Characteristics 中完成。看起来特征和服务是使用以下命令从 Activity_BTLE_Services 传递到 Dialog_BTLE_Characteristic 类的。
Dialog_BTLE_Characteristic dialog_btle_characteristic = new Dialog_BTLE_Characteristic();
dialog_btle_characteristic.setTitle(uuid);
dialog_btle_characteristic.setService(mBTLE_Service);
dialog_btle_characteristic.setCharacteristic(characteristic);
然后在Dialog_BTLE_Characteristic类中使用特性来发送数据（输出）：
characteristic.setValue(output);
service.writeCharacteristic(characteristic);
现在我想在 Fragment 中发送和接收数据。我如何将这些特征和服务传递给 Fragment？
你的帮助会很大。 海军陆战队
解决方法
在片段中执行 BLE 操作是不好的做法。创建一个执行 BLE 操作的辅助类，并且仅将解码数据发送到片段/活动以进行显示。
,我认为如果您将代码分成不同的文件，您可能会更好地移动。
我建议您将特征和设备 ID 传递给 fragment using a bundle：
public static MyFragment newInstance(int someInt) {
MyFragment myFragment = new MyFragment();
Bundle args = new Bundle();
args.putString("someInt",someString);
myFragment.setArguments(args);
return myFragment;
}
//-------
// In the fragment
getArguments().getInt("someString");
几年来我一直在编写一些非常糟糕的代码，但它确实解决了很多繁重的工作：
//By the way,I think this is the server,better known as "Central Module",not the peripheral. I've had this misunderstanding until recently and still need to change the code
public class BLEPeripheral {
private String deviceId;
private BLEManager connector;
private BluetoothAdapter bluetoothAdapter;
private BluetoothLeScanner bluetoothLeScanner;
private BluetoothGatt bluetoothGatt;
private BluetoothGattService bluetoothGattService = null;
private HashMap<String,Command<String>> subscriptions;
private boolean connected = false;
public boolean isConnected() {
return connected;
}
public BLEPeripheral(BLEManager connector,String deviceId) {
this.connector = connector;
this.deviceId = deviceId;
this.connector.onDisconnected();
final BluetoothManager bluetoothManager = (BluetoothManager) this.connector.getContext().getSystemService(Context.BLUETOOTH_SERVICE);
bluetoothAdapter = bluetoothManager.getAdapter();
if (bluetoothAdapter == null || !bluetoothAdapter.isEnabled()) {
this.connector.enableBluetooth();
return;
}
if (!this.connector.checkPermission()) return;
scanForDevice();
}
public void scanForDevice() {
connected = false;
connector.log("BT ENABLED: SCANNING FOR DEVICES");
connector.reportState(BleManagerStatus.SEARCH_START);
bluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
bluetoothLeScanner.startScan(mLEScanCallback);
}
public void stopScan() {
connector.reportState(BleManagerStatus.SCAN_CANCEL);
bluetoothLeScanner.stopScan(mLEScanCallback);
}
private final ScanCallback mLEScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType,ScanResult result) {
BluetoothDevice device = result.getDevice();
ScanRecord record = result.getScanRecord();
if (record == null) {
connector.log(String.format("Device [%s] has no scan record",device.getAddress()));
return;
}
String name = record.getDeviceName();
String UUID = null;
if (record.getServiceUuids() != null) {
for (ParcelUuid pId : record.getServiceUuids()) {
if (pId.getUuid().toString().equals(deviceId)) {
UUID = pId.getUuid().toString();
}
}
}
if (UUID == null) {
if (name != null) connector.log(String.format("Discovered Device [%s]. Continuing search",name));
return;
}
connector.log(String.format("Peripheral [%s] located on Device [%s]. Attempting connection",UUID,name));
bluetoothGatt = device.connectGatt(connector.getContext(),true,mGattCallback);
stopScan();
connector.reportState(BleManagerStatus.DEVICE_FOUND);
super.onScanResult(callbackType,result);
}
};
private void closeGatt() {
connector.reportState(BleManagerStatus.DICSONNECT);
connector.onDisconnected();
if (bluetoothGatt == null) {
return;
}
bluetoothGatt.close();
bluetoothGatt = null;
scanForDevice();
}
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
StringBuilder buffer;
@Override
public void onConnectionStateChange(BluetoothGatt gatt,int status,int newState) {
connector.onConnectionStateChange(newState);
if (newState == BluetoothProfile.STATE_CONNECTED) {
connector.log("Connected to device GATT. Discovering services");
connector.reportState(BleManagerStatus.DEVICE_CONNECTED);
bluetoothGatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
connector.log("Disconnected from GATT server. Continuing scanning");
closeGatt();
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt,int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
if (bluetoothGatt.getServices() != null) {
connector.log("Services discovered: ["+bluetoothGatt.getServices().size()+"]");
for (BluetoothGattService service : bluetoothGatt.getServices()) {
if (service.getUuid().toString().equals(deviceId)) {
bluetoothGattService = service;
connector.onConnected();
connector.log("Service discovered");
connector.log("Attempting characteristic subscription");
connector.subscribeToCharacteristics();
}
}
}
} else {
connector.log(String.format("onServicesDiscovered received: [%s]",status));
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,BluetoothGattCharacteristic characteristic,int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
connector.log(String.format("onCharacteristicRead received: [%s] value: [%s]",characteristic.getUuid().toString(),new String(characteristic.getValue())));
} else {
connector.log(String.format("onCharacteristicRead fail received: [%s]",status));
}
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt,int status) {
super.onCharacteristicWrite(gatt,characteristic,status);
if (status == BluetoothGatt.GATT_SUCCESS) {
connector.log(String.format("onCharacteristicWrite received: [%s] value: [%s]",new String(characteristic.getValue())));
}
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt,BluetoothGattCharacteristic characteristic) {
String packet = new String(characteristic.getValue());
if (packet.equals(String.valueOf((char)2))) {
buffer = new StringBuilder();
} else if (packet.equals(String.valueOf((char)3))) {
if (subscriptions == null || subscriptions.size() == 0) return;
Command<String> handler = subscriptions.get(characteristic.getUuid().toString());
if (handler != null) handler.execute(new String(buffer.toString()));
} else {
buffer.append(packet);
}
}
};
public BluetoothGattService getService() {
return bluetoothGattService;
}
private BluetoothGattCharacteristic findCharacteristicById(String id) {
if (bluetoothGattService.getCharacteristics() != null) {
return bluetoothGattService.getCharacteristic(java.util.UUID.fromString(id));
}
return null;
}
public void subscribe(String characteristicId,Command<String> handler){
if (subscriptions == null) subscriptions = new HashMap<>();
BluetoothGattCharacteristic characteristic = findCharacteristicById(characteristicId);
if (characteristic == null) {
connector.log("Characteristic does not exist");
return;
}
connected = true;
connector.reportState(BleManagerStatus.CHARACTERISTIC_SUBSCRIBED);
bluetoothGatt.setCharacteristicNotification(characteristic,true);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
bluetoothGatt.writeDescriptor(descriptor);
subscriptions.put(characteristicId,handler);
}
public void writeCharacteristic(String characteristicId,String data) {
BluetoothGattCharacteristic characteristic = findCharacteristicById(characteristicId);
if (characteristic != null) {
characteristic.setValue(data);
bluetoothGatt.writeCharacteristic(characteristic);
connector.log(String.format("Wrote [%s] to [%s]",data,characteristicId));
} else {
connector.log(String.format("[%s] not found on device",characteristicId));
}
}
public void readCharacteristic(String characteristicId) {
BluetoothGattCharacteristic characteristic = findCharacteristicById(characteristicId);
if (characteristic == null) return;
bluetoothGatt.readCharacteristic(characteristic);
}
}
然后我只需要传入一个BLEManager的实例，就是一个简单的接口：
public interface BLEManager {
void log(String message);
void reportState(BleManagerStatus status);
void onConnectionStateChange(int newState);
Context getContext();
void enableBluetooth();
void onConnected();
void subscribeToCharacteristics();
void onDisconnected();
boolean checkPermission();
}
您的片段/活动可以实现这一点。我认为这被称为 adapter pattern，因为我将 BLE 的实现从 Android 生命周期中抽象出来。
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